V. The Sacramental Sacrifice Thanksgiving, Memorial, Presence

From The Catechism of the Catholic Church

1356
If from the beginning Christians have celebrated the Eucharist and in a form
whose substance has not changed despite the great diversity of times and
liturgies, it is because we know ourselves to be bound by the command the Lord
gave on the eve of his Passion: “Do this in remembrance of
me.”¹⁸¹

PART TWO: THE CELEBRATION OF THE CHRISTIAN MYSTERY

SECTION TWO THE SEVEN SACRAMENTS OF THE CHURCH
- CHAPTER ONE THE SACRAMENTS OF CHRISTIAN INITIATION
  - Article 3 THE SACRAMENT OF THE EUCHARIST
    - V. The Sacramental Sacrifice Thanksgiving, Memorial, Presence

From The Catechism of the Catholic Church – rosary.team